US2010232630A1PendingUtilityA1
Acoustic multi-pole array and methods of packaging and controlling the same
Est. expiryMar 16, 2029(~2.6 yrs left)· nominal 20-yr term from priority
H04R 1/403
40
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Claims
Abstract
Provided are an acoustic multi-pole array and methods of packaging and controlling the same. The methods include packaging first and second sound devices constituting an acoustic multi-pole array to have different sound characteristics or the same sound characteristic, arranging the first and second sound devices in tandem, and then respectively inputting sound sources having the same magnitude and different phases to the first and second sound devices to improve forward directivity and reduce a backward radiation characteristic.
Claims
exact text as granted — not AI-modified1 . A method of packaging an acoustic multi-pole array, comprising:
separately packaging first and second sound devices to have different sound characteristics or the same sound characteristic; and arranging the first and second sound devices in tandem to improve forward directivity and reduce a backward radiation characteristic.
2 . The method of claim 1 , wherein separately packaging the first and second sound devices comprises packaging the first sound device to have a dipole sound characteristic and the second sound device to have a monopole sound characteristic.
3 . The method of claim 2 , wherein separately packaging the first and second sound devices further comprises packaging the first sound device to have the dipole sound characteristic represented by
p
(
r
,
θ
,
t
)
=
-
i
Q
ρ
c
k
2
d
4
π
r
cos
(
θ
)
(
ω
t
-
kr
)
where r denotes a distance between the center of a sound device and a structure, θ denotes an angle between the center of the sound device and a hearing position, d(k*d<<1) denotes the length of the structure surrounding the sound device, and Q, ρ, c, k, and ω denote the intensity, density, speed of sound, wave number, and frequency of a sound source input to the sound device, respectively.
4 . The method of claim 2 , wherein separately packaging the first and second sound devices further comprises packaging the second sound device to have the monopole sound characteristic represented by
p
(
r
,
θ
,
t
)
=
i
Q
ρ
c
k
4
π
r
(
ω
t
-
kr
)
where r denotes a distance between the center of a sound device and a structure, θ denotes an angle between the center of the sound device and a hearing position, and Q, ρ, c, k, and ω denote the intensity, density, speed of sound, wave number, and frequency of a sound source input to the sound device, respectively.
5 . The method of claim 1 , wherein separately packaging the first and second sound devices comprises packaging both of the first and second sound devices to have a monopole sound characteristic.
6 . The method of claim 1 , wherein arranging the first and second sound devices in tandem comprises arranging the first and second sound devices in tandem to improve the directivity on a front side by amplification of two audio signals output from the first and second sound devices and to reduce the radiation characteristic on a back side by canceling between the two audio signals output from the first and second sound devices.
7 . The method of claim 1 , wherein the first sound device and the second sound device have a number equal to or greater than one.
8 . A method of controlling an acoustic multi-pole array, comprising:
respectively inputting sound sources having the same magnitude and a phase difference of θ to first and second sound devices packaged to be arranged in tandem and have different sound characteristics or the same sound characteristic to improve forward directivity and reduce a backward radiation characteristic.
9 . The method of claim 8 , further comprising, when distortion occurs in a sound characteristic of one of the first and second sound devices, adjusting a magnitude and a phase of a sound source input to one of the first and second sound devices with respect to a sound source input to the other sound device.
10 . The method of claim 9 , wherein adjusting the magnitude and the phase comprises, when distortion occurs in a sound characteristic of the second sound device, inputting a sound source having a first magnitude to the first sound device and a sound source having a second magnitude and a phase changed by θ+α(α is a phase distortion caused by packaging) to the second sound device.
11 . The method of claim 8 , wherein the first sound device and the second sound device have a number equal to or greater than one.
12 . The method of claim 8 , further comprising controlling the magnitude and phases of the sound sources respectively input to the first and second sound devices to maximize an acoustic energy difference between a hearing space and a non-hearing space and a sound radiation efficiency of the first and second sound devices.
13 . An acoustic multi-pole array, comprising:
first and second sound devices arranged in tandem; and a phase and sound pressure adjuster for adjusting phases and sound pressures of sound sources respectively input to the first and second sound devices, wherein the phase and sound pressure adjuster inputs the sound sources having the same magnitude and the different phases to the first and second sound devices packaged to have different sound characteristics or the same sound characteristic to improve forward directivity and reduce a backward radiation characteristic.
14 . The acoustic multi-pole array of claim 13 , wherein the first sound device is packaged to have a dipole sound characteristic, and the second sound device is packaged to have a monopole sound characteristic.
15 . The acoustic multi-pole array of claim 13 , wherein both of the first and second sound devices are packaged to have a monopole sound characteristic.
16 . The acoustic multi-pole array of claim 13 , wherein the phase and sound pressure adjuster adjusts the phases and the sound pressures of the sound sources respectively input to the first and second sound devices to maximize an acoustic energy difference between a hearing space and a non-hearing space and a sound radiation efficiency of the first and second sound devices.
17 . The acoustic multi-pole array of claim 13 , wherein the first and second sound devices are voice coil speakers, piezoelectric speakers, or ultrasonic transducers.Join the waitlist — get patent alerts
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